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Title: The heat released during catalytic turnover enhances the diffusion of an enzyme

Journal Article · · Nature (London)
DOI:https://doi.org/10.1038/nature14043· OSTI ID:1257853
 [1];  [1];  [2];  [1];  [3];  [4];  [5];  [6]
  1. Univ. of California, Berkeley, CA (United States). California Institute for Quantitative Biosciences
  2. Univ. of California, Berkeley, CA (United States). California Institute for Quantitative Biosciences; Univ. of Chile, Santiago (Chile)
  3. Indiana University-Purdue University, Indianapolis, IN (United States)
  4. Univ. of California, Berkeley, CA (United States). California Institute for Quantitative Biosciences; Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology
  5. Indiana University-Purdue University, Indianapolis, IN (United States); Indiana University School of Medicine, IN (United States)
  6. Univ. of California, Berkeley, CA (United States). California Institute for Quantitative Biosciences; Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology; Univ. of California, Berkeley, CA (United States). Jason L. Choy Laboratory of Single-Molecule Biophysics and Department of Physics; Univ. of California, Berkeley, CA (United States). Howard Hughes Medical Institute; Univ. of California, Berkeley, CA (United States). Kavli Energy Nano Sciences Institute

Recent studies have shown that the diffusivity of enzymes increases in a substrate-dependent manner during catalysis. Although this observation has been reported and characterized for several different systems, the precise origin of this phenomenon is unknown. Calorimetric methods are often used to determine enthalpies from enzyme-catalysed reactions and can therefore provide important insight into their reaction mechanisms. The ensemble averages involved in traditional bulk calorimetry cannot probe the transient effects that the energy exchanged in a reaction may have on the catalyst. Here we obtain single-molecule fluorescence correlation spectroscopy data and analyse them within the framework of a stochastic theory to demonstrate a mechanistic link between the enhanced diffusion of a single enzyme molecule and the heat released in the reaction. We propose that the heat released during catalysis generates an asymmetric pressure wave that results in a differential stress at the protein-solvent interface that transiently displaces the centre-of-mass of the enzyme (chemoacoustic effect). We find this novel perspective on how enzymes respond to the energy released during catalysis suggests a possible effect of the heat of reaction on the structural integrity and internal degrees of freedom of the enzyme.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1257853
Journal Information:
Nature (London), Vol. 517, Issue 7533; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 156 works
Citation information provided by
Web of Science

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Artificial molecular and nanostructures for advanced nanomachinery journal January 2018
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Chemical and hydrodynamic alignment of an enzyme text January 2018
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